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8XC196MC, MD, MH USER'S MANUAL
To prevent the CMOS inputs from floating, the bidirectional port pins are weakly pulled high dur-
ing and after reset, until your software writes to Px_MODE. The default values of the control reg-
isters after reset configure the pins as high-impedance inputs with weak pull-ups. To ensure that
the ports are initialized correctly and that the weak pull-ups are turned off, follow this suggested
initialization sequence:
1.
Write to Px_DIR to establish the individual pins as either inputs or outputs. (Outputs will
drive the data that you specify in step 3.)
— For a complementary output, clear its Px_DIR bit.
— For a high-impedance input or an open-drain output, set its Px_DIR bit. (Open-drain
outputs require external pull-ups.)
2.
Write to Px_MODE to select either I/O or special-function mode. Writing to Px_MODE
(regardless of the value written) turns off the weak pull-ups. Even if the entire port is to be
used as I/O (its default configuration after reset), you must write to Px_MODE to ensure
that the weak pull-ups are turned off.
— For a standard I/O pin, clear its Px_MODE bit. In this mode, the pin is driven as
defined in steps 1 and 3.
— For a special-function signal, set its Px_MODE bit. In this mode, the associated
peripheral controls the pin.
3.
Write to Px_REG.
— For output pins defined in step 1, write the data that is to be driven by the pins to the
corresponding Px_REG bits. For special-function outputs, the value is immaterial
because the peripheral controls the pin. However, you must still write to Px_REG to
initialize the pin.
— For input pins defined in step 1, set the corresponding Px_REG bits.
Table 6-8 lists the control register values for each possible configuration. For special-function
outputs, the Px_REG value is irrelevant (don't care) because the associated peripheral controls
the pin in special-function mode. However, you must still write to Px_REG to initialize the pin.
For a bidirectional pin to function as an input (either special function or port pin), you must set
Px_REG.
6-10
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